You are in a place that is extremely hot and dense. You can't see far because your surroundings are opaque to light. Around you, nuclear fusion is converting carbon into oxygen and other elements. Where are you?
A) You are inside a nuclear power plant on Earth.
B) You are in the center of a star very much like our Sun.
C) You are in the center of a white dwarf.
D) You are in the early universe during the era of nucleosynthesis.
E) You are in the center of a massive star near the end of its life.
E
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Bulk Modulus: A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?
A. There has been no change in the density of the iron. B. Its density decreases slightly. C. Its density increases slightly. D. Its density becomes 21 times greater than what it was at the surface. E. Its density becomes 1/21 what it was at the surface.
Compared to microwaves, the velocity of visible light waves in a vacuum is
A. more B. the same C. less
When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy
A) less than 40 J. B) more than 40 J. C) of 40 J.
The half-life of radium is
A) the time after which an individual radium atom splits in half. B) the time during which half of a large number of radium atoms will decay. C) half the lifetime of the individual radium atom. D) the life-time of the individual radium atom. E) half of the total time during which a quantity of radium will radioactively decay.